imx93 wrong clock frequency

spawn — Mon, 13 Jan 2025 16:08:04 GMT

Hello,

on an imx93 processor, I configured a clock in the device tree with:

&flexio2 { assigned-clocks = <&clk IMX93_CLK_FLEXIO2>; assigned-clock-parents = <&clk IMX93_CLK_SYS_PLL_PFD1_DIV2>; assigned-clock-rates = <80000000>; status = "okay"; xx { compatible = "xx,xx"; pinctrl-0 = <&pinctrl_xx>; pinctrl-names = "default"; clocks = <&clk IMX93_CLK_CCM_CKO1>; assigned-clocks = <&clk IMX93_CLK_CCM_CKO1>; assigned-clock-rates = <50000000>; }; };

Then I confirmed that the clock freq is configured to be 50 MHz from the driver with a call to clk_get_rate().

But the signal frequency I measure is in fact 10 MHz.

Do you know what could cause the issue ?

Best Regards

Re: imx93 wrong clock frequency

Bio_TICFSL — Tue, 14 Jan 2025 14:19:45 GMT

Hello,

The following resource shows how to change DRAM frequency.

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/iMX-8M-Mini-Register-Programming-Aid-DRAM-PLL-setting/ta-p/1112094

It is for Mx8MM but it works on Mx93. clocks are described in sect. Clock Control Module (CCM) Chapter 30 i.mx93 reference manual

in uboot sources one can look at

imx-common\arm\arch - uboot-imx - i.MX U-Boot

in linux one needs to follow clock framework rules:
https://www.kernel.org/doc/Documentation/clk.txt
https://elinux.org/images/b/b8/Elc2013_Clement.pdf

Regards

i.MX Processorsのトピックimx93 wrong clock frequency

imx93 wrong clock frequency

Re: imx93 wrong clock frequency